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United States Patent | 5,510,147 |
Volpe | April 23, 1996 |
A relaxed sol-gel composition and a coated substrate article which is produced therefrom. A tetrafunctional alkoxide silicate is hydrolyzed in an aqueous solution together with a Lewis acid or metal chelate catalyst with optional protic acid until a viscosity of 2600-3200 cps is obtained to form a crosslinked sol-gel polymer composition. The polymer is relaxed by diluting it with water or water plus alcohol optionally containing a Lewis acid or metal chelate until a viscosity of about 1 cps is obtained while not depolymerizing the polymer. The relaxed polymer has substantially no visible polymer particles. The relaxed polymer composition is uniformly coating a substrate and dried without requiring an in-situ curing.
Inventors: | Volpe; Raymond A. (Highland Mills, NY) |
Assignee: | International Paper Company (Purchase, NY) |
Appl. No.: | 398636 |
Filed: | March 3, 1995 |
Current U.S. Class: | 427/397.7; 427/402; 516/111 |
Intern'l Class: | B05D 003/02 |
Field of Search: | 252/315.5,315.6,313.2 106/287.16 501/12 427/402,397.7 |
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